Method of and product for rebuilding tampers on compaction rollers



Feb. 9, 1965 K. v. LUTZ METHOD OF AND PRODUCT FOR REBUILDING TAMPERS ONCOMPACTION ROLLERS Filed April 1, 1963 INVENTOR.

v w m y Dov ow w R H "M 0 |-QQN m m K Q m 1% B I v u u u v0.0 A u w nin? 3: E. 3 ig 0 Q N d a Fm w 0 g :fi a A a =5 w s @E ME METHOD OF ANDUnited States Patent 3,168,767 PRODUCT FOR REBUILDMG TAMPERS 0NCGMFACTIQN ROLLERS Kenneth V. Lutz, 13931 Carmen Road, Cupertino, Calif.Filed Apr. 1, 1963, Ser. No. 269,689 1 (Jlaim. (@l. 22-203) The presentinvention relates in general to compaction rollers, and moreparticularly to a method of and prod not for rebuilding worn tampers oncompaction rollers.

Compaction rollers include a drum with radially dis posed tampers thatserve to pack road fill materials. The fill materials packed by thetampers have an abrasive eifect on the tampers and tend to causeexcessive wear on the edges of the tempers. As a result thereof, thetempers are reduced in height and also reduced in Width at the free endsthereof. Consequently, the efiectiveness of the tampers for packing fillmaterials is lessened.

An object of the present invention is to provide an improved method forrebuilding worn tampers on a compaction roller.

Another object of the present invention is to provide a method forrebuilding worn tampers on a compaction roller whereby the rebuilttampers have improved durability.

Another object of the present invention is to provide an improved methodfor recasting the free end of a worn tamper on a compaction roller toreplace the Worn portion of the tamper.

Another object of the present invention is to provide a tamper ring tobe employed in rebuilding a worn tamper.

Another object of the present invention is to provide a tamper ringwhich is employed in rebuilding a Worn tamper that self-adjusts to andfits the contour of a worn tamper.

Another object of the present invention is to provide a permanentlyattached ring which is employed in rebuilding a Worn tamper that reducesthe tendency for side wear on the rebuilt tamper.

Another object of the present invention is to provide a tamper ring forrecasting the free end of a Worn tamper on a compaction roller whichimproves the durability of the recast tamper.

Another object of the present invention is to provide a tamper ring forrebuilding a worn tamper that becomes a permanent part of the rebuilttamper and also serves as a mold While recasting the Worn tamper.

Other and further objects and advantages of the present invention willbe apparent to one skilled in the art from the following descriptiontaken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a compaction roller having rebuilttampers projecting from the drums thereof.

FIG. 2 is an elevation view of the tamper ring of the present inventionemployed in rebuilding a worm tamper.

FIGS. 3-5, inclusive, are illustrations of the steps included in themethod of the present invention for rebuilding a worn tamper on acompaction roller.

FIG. 6 is an elevation view of a modification of the tamper ring shownin FIG. 2.

Illustrated in FIG. 1 is a well-known or conventional compaction roller10, which comprises cylindrical drums 11. The drums 11 are supported ina well-known manner for rotation about a horizontal axis that travels ina path parallel to the ground. Projecting radially from cylindricalwalls 11a of the drums 11 are a plurality of tampers 15 formed ofshanks, which were worn and rebuilt in accordance with the presentinvention.

The compaction roller 10 serves to pack road fill mate- 3,168,767Patented Feb. 9., 1965 rial. The drums 11 of the compaction roller 10are filled with Water and are supported for rotation to travel over fillmaterial. In so'doing, tampers 15a thereof (FIGS. 3-5) pack the fillmaterial. The'movement of the tampers 15a over the fill material resultsin an abrasive action on the free ends 15b (FIGS. 35) of the tampers15a. Consequently, the tempers 15a become worn and are reduced in heightand width, thus lessening their eflectiveness for compacting the fillmaterial. Hence, the worn tampers 15a are required to be rebuilt orrecast at the free ends 15b thereof to form the rebuilt or recasttampers 15 (FIG. 1).

In carrying out the method of the present invention, a tamper ring (FIG.2) or an apertured body is employed, which is made from a suitable hardmaterial, such as steel. The tamper ring 20 includes an outer Wall 200having an inverted frustoconical configuration. An inner wall Ztlb ofthe tamper ring 20 has substantially a frustoconical configuration. Atthe lower extremity thereof, the inner wall 201) tapers at a greaterrate along the sur face Ztic. At the uppermost portion of the tamperring 20 between the Walls 20a and 20b thereof is an annular flange 20d.

As shown in FIG. 3, the tamper ring 26 is disposed to enclose the freeend 15b of the Worn tamper 15a with the inner wall 20b thereof inengagement with the tamper 15a. The annular flange 20d is spaced fromthe free end 15b of the worn tamper 15a. Accordingly, a cavity is formedwith the inner wall 20b of the tamper ring 20 in abutment with the worntamper 15.

Since the inner wall 20b of the tamper ring 20 is tapered or has afrusto-conical configuration, the tamper ring 20 is self-adjusting inadapting itself to the contour of the worn tamper 15a. The annularflange 243d of the tamper ring 20 is spaced from the free end 15b of theWorn tamper 15a and serves to reduce any further side wear on the worntamper 15a after the worn tamper 15a is recast.

After the tamper ring 20 is positioned to surround the free end 15b ofthe worn tamper 15a, the tamper ring 20 is welded in a conventional andwell-known manner to the worn tamper 15a (FIG. 4). A welding bead 30 isformed between the inner wall 20b of the ring tamper 2i and the worntamper 15a as shown in FIGS. 4 and 5. The welding head 30 may be madefrom the product Isorod, which is manufactured by The Resisto-Loy Co.Inc., of Grand Rapids, Michigan. Isorod constitutes a drawn high alloycoated rod containing chrome, molybdenum and carbon. More particularly,Isorod" com prises the following ingredients by Weight:

Percent Chrome 12 Carbon .2 Molybdenum 1 Titanium .7 Boron .9 Iron 86.1

Thus, the tamper ring 20 is permanently and fixedly secured to the worntamper 15a.

With the tamper ring 20 welded to the Worn tamper 15a, the cavity 25 isthen filled with a hardfaced, durable, material (FIG. 5), until theexposed surface thereof is even with the exposed surface of the annularflange 20d of the tamper ring 20. Such a hard, durable material mayconsist of the products Isorod and Manga-Tone N.M., which aremanufactured by the aforementioned The Resisto-Loy Co. Inc. Manga-ToneN.M. constitutes a nickel-manganese alloy containing nickel, manganese,with vanadium and carbon. More specifically, the

, Percent Carbon 1.8 to 2.0 Nickel 8.0 to 9;0 Manganese 26.0 to 28.0Vanadium 1.3 to 1.5 Iron 7 62.9 to 59.5

In the preferred embodiment, there is an equal amount of lsorod andManger-Tone NM. to form the material for filling the cavity 25, whichare heated to a molten state and allowed to cool. The lsorod is used tobond and blend in with the Manga-Tone N.M.

From the foregoing, it is to be observed that the tamper ring 20 becomesa permanent part of the rebuilt or recast tamper 15. Also, the tamperring 20 serves as a mold to form the shape of the hard, durable materialfilling the cavity 25. In addition, the tamper ring 20 functions as acrucible for containing a molten state of the hard, durable materialfilling the cavity 25. Moreover, the annular flange 20d will engage thefill material to be compacted by the compaction roller 10 and thusreduces any further side wear on the worn tamper a.

A modification 40 of the tamper ring is shown in FIG. 6, which is madefrom a suitable hard material, such as steel. The tamper ring 40comprises an outer inverted frusto-conical wall 40a and an innerfrustoconical wall 40b. At the lowermost extremity of the ring tamper40, an outer wall 400 tapers at a greater rate than the outer wall 40ato facilitate the welding of the tamper ring 40 to the worn tamper 15a.An annular flange Mini is formed at the uppermost extremity of thetamper ring 40. The tamper ring 40 functions in the same manner as thetamper ring 20 for recasting or rebuilding the worn tamper 15a to formthe the rebuilt tamper 15. I

In rebuilding the worn tamper 15a (FIG. 3) or in recasting the free end1511 of the worn tamper 15a to form the rebuilt tamper 15 (FIG. 1), thetamper ring 20 (FIG. 2) is disposed to surround the free end 15b of theworn tamper 15a and in engagement with the worn tamper 15a to form thecavity (FIG. 3). Thereupon, the tamper ring 20 is welded to the worntamper 15a to be permanently and fixedly attached thereto (FIG. 4). Atthis time, a hard, durable material in a molten state is containedwithin the cavity 25 with the exposed surface thereof even with theexposed surface of the annular flange 20d of the tamper ring 20 (RIG.5). The material as is formed to the shape of the inner wall 20b of thetamper ring 20. After the material 35 cools and is hardened, the recastor rebuilt tamper 15 is formed (FIG. 1).

It is to be undestood that modifications and variations of theembodiment of the invention disclosed herein may be resorted to Withoutdeparting from the spirit of the invention and the scope of the appendedclaim.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

A method of recasting a worn tamper of a compaction roller comprisingthe steps of disposing a tamper ring around the free end of a Worntamper with a tapered inner wall of the tamper ring in engagement withthe worn tamper, said tamper ring being arranged to form an enclosurearound the free end of said worn tamper with an annular flange of thetamper ring spaced from and communicating with the exposed surface ofsaid free end of said worn tamper, permanently securing said tamp erring to said worn tamper with a welding alloy, and filling the spacebetween said worn tamper and said tamper ringwith a hard wear resistantmetallic filler material in a molten state until the exposed surface ofsaid filler material is substantially even with said annular flange,whereby after said filler material cools a recast tamper is formed fromsaid worn tamper, said tamper ring and said filler material.

References Iited by the Examiner UNITED STATES PATENTS 1,807,477 5/ 31Hume 22-203 2,334,778 11/43 LeTourneau 94-5O 2,463,065 3/49 Stevenson22-203 2,503,161 4/50 LeTourneau 9450 3,020,610 2/62 Rejdak 222033,040,638 6/ 62 Atkinson 94-50 MICHAEL V. BRINDISI, Primary Examiner.

MARCUS U. LYONS, Examiner.

